The stereochemical course of addition of allyltrimethylsilane to protected l-alaninals and l-serinals in the presence of Lewis acids. Total synthesis of cis-(2R,3S)-3-hydroxyproline
作者:D. Gryko、P. Prokopowicz、J. Jurczak
DOI:10.1016/s0957-4166(02)00255-0
日期:2002.6
l-alaninals and l-serinals was investigated and high levels of asymmetric induction were achieved. Stereochemical models for rationalisation of the results obtained are proposed. cis-(2R,3S)-3-Hydroxyproline was synthesised starting from N-Cbz,O-TBS-l-serinal, in which the crucial step involves addition of allyltrimethylsilane to the aldehyde in the presence of SnCl4.
研究了路易斯酸对将烯丙基三甲基硅烷添加到各种受保护的l-丙氨酸和l-丝氨酸中的非对映选择性的影响,并实现了高水平的不对称诱导。提出了立体化学模型,用于合理化所获得的结果。顺式-(2 R,3 S)-3-羟基脯氨酸从N -Cbz,O -TBS-1-丝氨酸开始合成,其中关键步骤涉及在SnCl 4存在下向烯醛中添加烯丙基三甲基硅烷。